Question: = 1 = 2 = 3 = 4 5 = 6 =7 8 = 9 = 10 = 11 = 12 = 13 Surgical complications:

= 1 = 2 = 3 = 4 5 = 6 =7 8 = 9 = 10 = 11 = 12 = 13 Surgical complications: A medical researcher wants to construct a 98% confidence interval for the proportion of knee replacement surgeries that result in complications. Part 1 of 2 (a) An article in a medical journal suggested that approximately 20% of such operations result in complications. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.08? A sample of operations is needed to obtain a 98% confidence interval with a margin of error of 0.08 using the estimate 0.2 for p. X 5 Part: 1 / 2 Part 2 of 2 (b) Estimate the sample size needed if no estimate of p is available. A sample of operations is needed to obtain a 98% confidence interval with a margin of error of 0.08 when no estimate of p is available. X 5

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